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1.
A phrase that is used mostly as an insult or a warning usually by someone one with a weapon who wants to kick the shit into you maybe because you have insulted them.
some guy: you're a fag
me: dont make me go upside your head

(then if they say ANYTHING you smack them. Or in my case smash them round the face with an old wrench that i 'aquired')
by Sex & Violence July 04, 2006
 
2.
Pimp slaping someone... The "up side" of your hand or back-hand is used instead of the palm. Commonly used when pimping women and they get out of line.
Pimp: Baby u owe me $500.

Pro: uhuh papa it is only $300...

Pimp: Dont make me upside your head!
by FistyCuffs October 02, 2006